Kinetics and Thermochemistry review

Increase in temperature

Increase reaction rate, increase collision frequency, increase kinetic energy of collisions, no change in activation energy

Increase in concentration

Decreased reaction rate, decrease collision frequency, no change kinetic energy of collisions, no change in activation energy

Addition of catalyst

Increase reaction rate, no change in collision frequency, no change in kinetic energy of collisions, decrease in activation energy

Increased surface area

Increase reaction rate, increase collision frequency, no change in kinetic energy of collisions, no change in activation energy

Low specific heat

Heats up and cools down quicker

High specific heat

Heats up and cools down slower

1 Calorie

1000 calories

Endothermic energy

Positive 🔼H, feels cold, absorbs energy, energy flows from surroundings to system

Exothermic reactions

Negative 🔼H, feels hot, releases energy, energy flows from system to surroundings

Temperature

Measure of average kinetic energy

Endothermic (feel cold) or exothermic (feel hot)

Endothermic

Endothermic (feels cold) or exothermic (feels hot)

Exothermic

activation energy on a diagram

Activated complex - PE of reactants

🔼H on a diagram

PE of products - PE of reactants

Specific heat of water

4.18 J/gC